உணர்மானவியல் (Tamil Wikipedia)

Analysis of information sources in references of the Wikipedia article "உணர்மானவியல்" in Tamil language version.

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archive.org

  • Page 10 of Raymond Davis, Jr. and F. M. Walters, Jr., Scientific Papers of the Bureau of Standards, No. 439 (Part of Vol. 18) "Sensitometry of Photographic Emulsions and a Survey of the Characteristics of Plates and Films of American Manufacture," 1922.

books.google.com

eastmanhouse.org

image.eastmanhouse.org